These days many pilots come equipped with such devices as the CX series flight computers and the E6B phone app, including myself. There is a great fundamental flaw in this: batteries die. We've all been there; we reach for the remote to mute the really loud commercial only to find the batteries dead. This is why it is always vital to A: carry spares, and B: have a manual computer. such as the E6B or CR-6.
During my training out of KGRR I had never even been introduced to the idea of a CX. It wasn't until I arrived for my collegiate training that caught wind of the CX-2, upon which I quickly ordered the CX-3. My immediate hesitation to using the CX-3 in the air was my unfamiliarity of its capabilities, but more importantly its limitations. I am still unsure as to what it is and is not able to do. Hence the personal policy of carrying my old reliable E6B, which I had been using for two years before ever flying an aircraft, and am highly comfortable with. For those out there who say "well I know my CX better than my CR" I choose to respond with a simple "fix that." Being unfamiliar with the manual systems is like knowing auto-pilot, but not stick and rudder, its just a plain old bad idea. In an emergency, skip the calculator, go strait to the hard steel wiz-wheel (or plastic, if that is the case).
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Photo used under Creative Commons from C. P. Ewing